Kéisén Associates, formerly Omori & Yaguchi, is a Tokyo-based Japanese intellectual property law firm  with offices in Tokyo, Philadelphia and New York City. Our practice offers a broad range of Japanese and international legal support in patent, design, and trademark law. We offer prior art search, in-house technical translations, international licensing, as well as legal consultation for international business development and technology transfer support in Japan.

Our highly skilled attorneys and patent agents are supported by a team of technical advisors, translators and an administrative staff who are fluent in English. We can provide clients with a seamless, efficient, and cost effective service in all areas intellectual property protection in Japan. 

We also provide highly skilled patent and trademark search in Japan.

Our Contact Information:
-Tokyo office: 
Keisen Associates
Aioi Nissay Dowa Sompo Nibancho Bldg. 8th Floor
Nibancho 5-6, Chiyoda-ku, Tokyo 102-0084
Tel: +81-3-6825-1418   
Fax: +81-3-6825-1423
e-mail:keisen_tky@keisenassociates.com

-Philadelphia office:
8 Penn Center, Suite 1100
1628 John F. Kennedy Blvd.
Philadelphia, PA  19103, USA
TEL: 215-701-6349
FAX: 215-751-0192
e-mail: keisen_phl@keisenassociates.com

Keisen Associates

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Keisen Associates

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